manual de instalación y operación del modulo ls-6 l-12
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LS-6N, LS-126/12-Channel Low Speed Data Modules
Megaplex-2100/2104 Version 11, Megaplex-4100 Version 1.2
INSTALLATION
AND
OPERATIONMANUAL
The Access Company
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LS-6N, LS-126/12-Channel Low Speed Data Modules
Megaplex-2100/2104 Version 11, Megaplex-4100 Version 1.2
Installation and Operation Manual
Notice
This manual contains information that is proprietary to RAD Data Communications Ltd. ("RAD").No part of this publication may be reproduced in any form whatsoever without prior writtenapproval by RAD Data Communications.
Right, title and interest, all information, copyrights, patents, know-how, trade secrets and otherintellectual property or other proprietary rights relating to this manual and to the LS-6N, LS-12and any software components contained therein are proprietary products of RAD protectedunder international copyright law and shall be and remain solely with RAD.
LS-6N, LS-12 is a registered trademark of RAD. No right, license, or interest to such trademark isgranted hereunder, and you agree that no such right, license, or interest shall be asserted byyou with respect to such trademark.
You shall not copy, reverse compile or reverse assemble all or any portion of the Manual or theLS-6N, LS-12. You are prohibited from, and shall not, directly or indirectly, develop, market,distribute, license, or sell any product that supports substantially similar functionality as theLS-6N, LS-12, based on or derived in any way from the LS-6N, LS-12. Your undertaking in thisparagraph shall survive the termination of this Agreement.
This Agreement is effective upon your opening of the LS-6N, LS-12 package and shall continueuntil terminated. RAD may terminate this Agreement upon the breach by you of any term hereof.Upon such termination by RAD, you agree to return to RAD the LS-6N, LS-12 and all copies andportions thereof.
For further information contact RAD at the address below or contact your local distributor.
24 Raoul Wallenberg StreetTel Aviv 69719, Israel
Tel: 972-3-6458181Fax: 972-3-6498250, 6474436E-mail: market@rad.com
900 Corporate DriveMahwah, NJ 07430, USA
Tel: (201) 5291100, Toll free: 1-800-4447234Fax: (201) 5295777E-mail: market@radusa.com
19882007 RAD Data Communications Ltd. Publication No. 764-229-11/07
mailto:market@rad.commailto:market@radusa.commailto:market@radusa.commailto:market@rad.com -
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LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2 Preliminary Preparation 1
Quick Start Guide
If you are familiar with the LS-6N, LS-12 modules, use this guide to prepare it for
operation.
1. Preliminary Preparation
Choose the interface mode of each external user channel: DTE or DCE by setting
the interface module switches, as shown in the figure below for LS-12.
SW1 SW13
SW2 SW14
SW3 SW15
SW4 SW16
SW5 SW17
SW6 SW18
SW7 SW19
SW8 SW20
SW9 SW21
Interface Mode
Selection
DCE
DTE
DTE
DCE
Channel 1
Channel 2
Channel 12
.
.
.
.
.
.
.
.
.
.
.
.
.SW12 SW24
SW10 SW22
SW11 SW23
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Quick Start Guide Installation and Operation Manual
2 Configuring the LS-6N, LS-12 Modules LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2
2. Installing the LS-6N, LS-12 Modules
1. Insert the module in the assigned I/O slot of the Megaplex enclosure.
2. Connect the user equipment to the module interface SCSI connectors.
3. Configuring the LS-6N, LS-12 Modules
MP-2100/2104 Chassis
Enter the command DEF CH SS * < >. The configuration parameters and
the allowed range of values are listed below.
Internal Port Parameters
Connect YES
Rate 32, 56, , 128, 192, 256, 384, 512
768 kbps (LS-12 only)
Operation Mode
UNI-BRD TX
UNI-BRD RX
Tandem Mode Future option, the only available value is .
ML Slot up to the maximum supported by the chassis
ML Channel* up to the maximum supported by the selected main
link module
External Port Parameters
Connect YES
Format ASYNC
Rate : 2.4, 4.8, , 19.2, 38.4
: 7.2, 14.4, 28.8, 57.6
: 8.0, 16.0, 24.0, 32.0, 48.0, 56.0, 64.0
Clock Mode
EXTERNAL
DTE
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Installation and Operation Manual Quick Start Guide
LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2 Configuring the LS-6N, LS-12 Modules 3
Control Sig
RTS
DTR&RTS
CTS
RTS
Data Bits
9
8
7
6
Total number of data and parity bits
Int
IN2 (for LS-12 only)
MP-4100 chassis
Configure the LS-6N, LS-12 internal port parameters, using the
screen.
The configuration parameters and the allowed range of values are listed below.
Internal Port Parameters
Admin Status Up
Rate 32, 56, , 128, 192, 256, 384, 512
768 kbps (LS-12 only)
Operation Mode
UNI-BRD TX
UNI-BRD RX
Tandem Mode Future option, the only available value is .
Destination Slot to IO-10
Destination Port 1 to 8 for external ports
1 to 63 (1 to 84) for internal (virtual) PDH ports
Configure the LS-6N, LS-12 external port parameters using the
screen.
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Quick Start Guide Installation and Operation Manual
4 Assigning Timeslots LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2
External Port Parameters
Admin Status Up
Format ASYNC
Rate : 2.4, 4.8, , 19.2, 38.4
: 7.2, 14.4, 28.8, 57.6
: 8.0, 16.0, 24.0, 32.0, 48.0, 56.0, 64.0
Clock Mode
EXTERNAL
DTE
Control Sig
RTSDTR&RTS
CTS
RTS
Data Bits
9
8
7
6
Total number of data and parity bits
In Port
IN2 (for LS-12 only)
4. Assigning Timeslots
Assign the required timeslot to each connected internal port.
When using the or mode in the module installed in the
MP-2100/2104 chassis, use the command to assign timeslots, and
the to assign a fraction of a timeslot if needed.
When using the mode in the module installed in the
MP-2100/2104 chassis, timeslot assignment for the receive direction is made
using the dedicated routing fields of the command.
For the module installed in the MP-4100 chassis, always use the
screen.
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LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2 i
Contents
1.1 Overview....................................................................................................................1-1
Applications............................................................................................................1-11.2 Physical Description ...................................................................................................1-21.3 Functional Description................................................................................................1-3
Purpose and Main Features.....................................................................................1-3Data Channel Characteristics...................................................................................1-4
Channel Rates....................................................................................................1-4Synchronous Data Channel Timing Modes...........................................................1-5Asynchronous Channel Characteristics ................................................................1-6Support of Interface Control Signals ...................................................................1-6
Diagnostics.............................................................................................................1-7Composite Data Stream Test and Loopback Functions ........................................1-7Data Channel Test and Loopback Functions ........................................................1-7
1.4 System Application Considerations.............................................................................1-8Routing to the Composite Channels ........................................................................1-8Bandwidth Allocation..............................................................................................1-9
Numerical Example ...........................................................................................1-111.5 Technical Specifications............................................................................................1-12
2.1 Introduction...............................................................................................................2-12.2 Setting the Internal Jumpers and Switches..................................................................2-12.3 Installing the Module in the Chassis............................................................................2-22.4 Connecting the Cables................................................................................................2-2
3.1 Overview....................................................................................................................3-13.2 Configuration Sequence for the MP-2100/2104 Chassis..............................................3-13.3 Configuration Sequence for the MP-4100 Chassis.......................................................3-23.4 Configuration Parameters...........................................................................................3-23.5 Assigning Timeslots....................................................................................................3-63.6 Displaying Status and Configuration Information ........................................................3-7
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Table of Contents Installation and Operation Manual
ii LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2
4.1 Test and Diagnostic Functions....................................................................................4-1
Composite Data Stream Loopback Functions ...........................................................4-1Composite Data Stream Remote Digital Loopback...............................................4-2
Data Channel Stream Loopback Functions ...............................................................4-4Data Channel Local Digital Loopback...................................................................4-4
Data Channel Remote Digital Loopback...............................................................4-5BER Testing on Data Channels ............................................................................4-5
Recommended Test Sequence.................................................................................4-64.2 Frequently Asked Questions.......................................................................................4-64.3 Technical Support ......................................................................................................4-7
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LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2 Overview 1-1
Chapter 1
Introduction
1.1 Overview
The LS-6N and LS-12 are data sub-multiplexer modules for use in Megaplex-2100,
Megaplex-2104, and Megaplex-4100 integrated access multiplexers. The modules
occupy one enclosure slot and provide six/twelve synchronous or asynchronous
data channels with ITU-T Rec. V.24/EIA RS-232 interfaces that can operate at
user-selectable data rates in the range of 2.4 to 64 kbps.
In this manual, the generic term is used when the information isapplicable all multiplexer versions. The complete designation is used only for
information applicable to a specific version.
Applications
Figure 1-1 shows a typical point-to-point application for a Megaplex system
equipped with LS-6N modules. In this application, the LS-6N modules connect a
group of remotely-located terminals to the central corporate computing
resources (a minicomputer or mainframe with communication front end).
E1/T1Network
MP-2100MP-2100
Minicomputeror
Mainframe
14.4 to512 kbps
14.4 to512 kbps
6 data channels(2.4 to 64 kbps)
6 data channels(2.4 to 64 kbps)
CBL-LS12octopus
cable
ML-T1ML-T1LS-6N LS-6N
Figure 1-1. Typical LS-6N Point-to-Point Application
Figure 1-2shows an application where LS-6N is used by Megaplex-2100 toconnect low speed data traffic such as data terminals, surveillance cameras, and
train track signaling equipment, over T1 TDM lines. In this combined TDM/IP
application, LS-6N is employed, together with HS-6N modules, for high speed
data channels, ML-IP modules for analog voice channels, and ML-2T1 modules for
digital voice channels. All data traffic is over a T1 line, while analog telephone and
digital PBX voice traffic is over IP. This is achieved using a single device,
Megaplex-2100.
Note
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Chapter 1 Introduction Installation and Operation Manual
1-2 Physical Description LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2
IP Network
T1 Network
T1
MP-2100
PBX
VC-8ML-IP
ML-2T1
HS-QN
ML-2T1
A.T.O.system
(Automatic TrainOperation)
Lowspeeddata
Surveillancecamera
TerminalWork Clock
Server
Scheduleinformation
High speed data
Analog voiceVo
ice Vo
ice
Data D
ata
Digital voice
LS-6N
12:45
64 kbps
2.4 kbps
n x 56, 64 kbps
9.6 kbps
4.8 kbps
NetworkManagementSystem
T1
MP-2100
PBX
VC-8
ML-IP
ML-2T1
HS-QN
ML-2T1
A.T.O.system
(Automatic TrainOperation)
Lowspeeddata
Surveillancecamera
TerminalWork Clock
Server
Scheduleinformation
High speed data
Analog voice
Digital voice
LS-6N
12:45
64 kbps
2.4 kbps
n x 56, 64 kbps
9.6 kbps
4.8 kbps
Figure 1-2. Connecting Low Speed Data Traffic over T1 TDM Lines with Line
Protection over IP Network
The module data channels have standard EIA RS-232/ ITU-T Rec. V.24 interfaces.
The interface type, DCE or DTE, is user-selectable by means of internal switches,
separately for each channel.
1.2 Physical Description
Typical panel of the LS-6N and LS-12 modules is shown in Figure 1-3and
Figure 1-4, respectively. The LS-6N panel includes one 68-pin female SCSI
connectors designated CH.1-6, for connection to the data channels. The LS-12
panel includes two such connectors designated CH.1-6 and CH.7-12. Connector
pin assignments and functions are given in Appendix A.
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Installation and Operation Manual Chapter 1 Introduction
LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2 Functional Description 1-3
LS-6N
CH.1-6
S. LOSS
Sync LossIndicator
ChannelConnector
LS-12
CH.
1-6
CH.7-12
S. LOSS
A B
S. LOSS B
Indicator
S. LOSS A
Indicator
CH.1-6
Connector
CH.7-12
Connector
Figure 1-3. LS-6N Panel Figure 1-4. LS-12 Panel
In addition, the module panels include alarm indicators. LS-12 has two alarm
indicators, designated S.LOSS A and B. Each indicator lights in case the
synchronization machine serving the corresponding composite channel, loses
synchronization to the incoming signal. LS-6N has only one indicator, designated
S.LOSS. During normal operation, the indicators are off.
1.3 Functional Description
Purpose and Main Features
The LS-6N and LS-12 modules are used to achieve highly efficient utilization of
the uplink bandwidth for low-speed transfer applications, by dividing the uplink
bandwidth into smaller units with very little overhead.
The uplink bandwidth required by one LS-6N or LS-12 module depends on thetotal channel data payload: the available selections are 14.4 kbps (quarter
timeslot), 32 kbps (half timeslot), 56 or 64 kbps (one timeslot), 128 kbps (two
timeslots), 192 kbps (three timeslots), 256 kbps (four timeslots), 384 kbps (six
timeslots), and 512 kbps (eight timeslots) and 768 kbps (twelve timeslots). The
uplink timeslots used by the LS-6N, LS-12 modules are user-selectable.
For flexibility, the LS-6N module is equipped with a single internal port, which is
used to form a composite data stream. All six external (user) ports are routed to
this internal port. The internal port can be routed to either of the Megaplex uplink
ports.
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Chapter 1 Introduction Installation and Operation Manual
1-4 Functional Description LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2
The LS-12 module is equipped with two internal ports, which can be used to form
two composite data streams. Each internal port can be routed to either of the
Megaplex uplink ports. External (user) ports can be routed to either of the two
internal ports (see details in the section below).
Data Channel Characteristics
The data channels have standard EIA RS-232/ ITU-T Rec. V.24 interfaces. The
interface type, DCE or DTE, is user-selectable by means of the interface module
internal switches, separately for each channel.
Each module channel can be configured for either synchronous or asynchronous
operation, with the asynchronous-to-synchronous conversion being made in
accordance with ITU-T Rec. V.14. The timing mode of channels configured for
operation in the synchronous mode is selectable.
Within the LS-6N module, channels are processed in three pairs: 1 and 2, 3 and 4,
5 and 6. Within the LS-12 module, channels are processed in six pairs: 1 and 2, 3
and 4, 5 and 6, 7 and 8, 9 and 10, 11 and 12.
Each pair of the external user channel must be routed to the same internal
composite channel, the user channels must also operate at the data rates
belonging to the same rate group and support the end-to-end transmission of
the matching control signals as explained in the following sections.
Each group of six data channels terminates on a single SCSI 68-pin female
connector, which enables connection of the LS-6N, LS-12 data channels to a
distribution frame. RAD also offers a special octopus cable, which ends in six
25-pin D-type male or female connectors, which enables the connection of each
channel directly to the users equipment.
The data rates and other operating parameters of the LS-6N, LS-12 data
channels are configured by means of the system management.
Channel Rates
Each channel supports three groups of data rates:
all the standard rates in the range of 2.4 to 38.4 kbps (except the
rates defined as belonging to Group 2 and Group 3), in either the
synchronous or asynchronous mode.
: 7.2, 14.4, 28.8 and 57.6 kbps, in either the synchronous or
asynchronous mode.
8, 16, 24, 32, 48, 56, and 64 kbps in the synchronous mode only.Channel rates can be freely selected, as long as both channels of a given pair operate
at rates taken from the same group. Channel data rates as well as all the channel
operating parameters are controlled by means of the system management.
Note
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Installation and Operation Manual Chapter 1 Introduction
LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2 Functional Description 1-5
Synchronous Data Channel Timing Modes
LS-6N, LS-12 channels configured for operation in the synchronous mode have
user-selectable timing modes, which can be independently selected for each
channel. Together with a set of internal channel buffers, these timing modes
permit connection to various types of digital lines, including digital data services,
and ensure data integrity.
The timing modes are as follows:
: when this timing mode is selected, the LS-6N/12 channel provides the
timing (transmit and receive clock signals) to the users equipment connected
to it. These clock signals are derived from the Megaplex nodal clock.
The DCE timing mode is intended for use when equipment with a DTE
interface is connected to the LS-6N/12 channel. To use this mode, the
interface of the LS-12 channel must be set to DCE (via the SW switch of the
relative channel).
the LS-6N/12 channel provides the receive timing signal
(derived from the Megaplex nodal clock) to the equipment connected to the
channel, and accepts the transmit timing from the connected equipment. In
this case, the LS-6N/12 channel internally buffers and retimes the transmit
data in accordance with the Megaplex nodal clock. Note that in order to avoid
clock slips, the transmit timing should be locked to the receive timing.
The external DCE timing mode is intended for use when the LS-6N/12 channel
is connected to equipment with DCE interface in a tail-end circuit. To use this
timing mode, the interface of the LS-6N/12 channel must be set to DTE (via
the SW switch of the relative channel).
the LS-6N/12 channel requires receive and transmit timing signals from
the equipment connected to the channel. To use this timing mode, the
interface of the LS-6N/12 channel must be set to DTE (via the SW switch of
the relative channel).
One of the LS-6N/12 channels operating in the DTE timing mode can be
selected as the reference timing source for the Megaplex nodal timing,
provided the channel data rate is a multiple of 8 kbps (8, 16, 24, 32, 48, 56,
or 64 kbps). In this case, the Megaplex system will actually use the transmit
clock of the selected LS-12 channel as long as the channel RTS line is active.
The DTE mode is mainly intended for use when the LS-6N/12 channel is
connected to equipment with DCE interface, which is used to provide the
timing reference for the Megaplex system (e.g., when the LS-6N/12 channel
is connected to a data network, or to a channel of a higher-level multiplexer).
The DTE mode can be also used when the equipment connected to thechannel uses timing derived from the same source used to provide the
Megaplex nodal clock reference.
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Chapter 1 Introduction Installation and Operation Manual
1-6 Functional Description LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2
Asynchronous Channel CharacteristicsThe timing mode of asynchronous channels is always DCE, i.e., the channel data
rates are derived from the Megaplex nodal timing.
For channels operating in the asynchronous mode, the number of data bits in the
word is user-programmable: 6, 7, 8, or 9. When parity is used, the total number
of bits to be taken into account includes the parity bit, because the parity bit is
transparently transferred.
In addition to the selected number of data bits, the word format includes one
start bit and one stop bit.
Support of Interface Control SignalsThe LS-6N, LS-12 modules provide two user-selectable modes of support for the
V.24/RS-232 interface control signals of its data channels:
This mode can be independently selected for
each channel. When local support is enabled, the channel locally supports five
interface control signals, that is, the state of the control signals is not
transmitted to the remote channel. The locally-supported control signals areas follows:
DTR: this is an input signal for channels with DCE interface, and an output
signal, always ON, for channels with DTE interface.
RTS: this is an input signal for channels with DCE interface, and an output
signal for channels with DTE interface.
CTS: this is an output signal for channels with DCE interface, and an input
signal for channels with DTE interface.
For channels with DCE interface, the user can select between
permanently asserting the CTS line (CTS line always ON), and making the
CTS line follow the state of the RTS line.
DSR: this is an output signal for channels with DCE interface, and an input
signal for channels with DTE interface.
For channels with DCE interface, the DSR line is constantly ON, except
when the link serving the internal port to which the channel is connected,
is down because of loss of frame synchronization.
DCD: this is an output signal for channels with DCE interface, and an
input signal for channels with DTE interface.
For channels with DCE interface, the DCD line is constantly ON, except
when the link serving the internal port to which the channel is connected,
is down because of loss of frame synchronization.
This capability is used when it is
necessary to transmit the state of the interface control signals, which control
the channel data flow through the Megaplex link, e.g., for applications which
require hardware flow control. To minimize bandwidth requirements, two
selections are available:
End-to-end transmission of local RTS line state to the remote DCD line,
and vice versa. Note that this mode is relevant only when the two
channels are configured with DCE interfaces.
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Installation and Operation Manual Chapter 1 Introduction
LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2 Functional Description 1-7
End-to-end transmission of local RTS line state to the remote DCD line,
and local DTR line to the remote DSR line, and vice versa. Note that this
mode is relevant only when a channel configured with DCE interface is
connected to a remote channel with DTE interface.
The end-to-end transmission mode can be independently selected for each
channel. However, when both channels of a given pair are configured for
end-to-end transmission, both must be configured to transmit the samenumber of control signals, i.e., you cannot configure one channel to transmit
one control signal (i.e., RTS to DCD) end-to-end, and the other channel - two
control signals (RTS and DTR). Typical end-to-end delay is 2.5 msec.
Diagnostics
The LS-6N, LS-12 modules automatically perform self-diagnostics upon power-up.
In addition, the modules include powerful testing capabilities which help reduce
downtime to a minimum.
The test and loopback functions are available at two levels:
Composite data streams generated by the module (the data streams sent tothe uplink).
Individual data channels.
These functions are controlled by means of the Megaplex system management.
Composite Data Stream Test and Loopback Functions
The module supports the following test and loopback functions on each
composite data stream:
Local digital loopback.
Remote digital loopback.
Data Channel Test and Loopback Functions
The module supports the following test and loopback functions on the individual
user data channels:
Local digital loopback.
Remote digital loopback.
Bit error rate testing (BERT) on the selected channel.
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Chapter 1 Introduction Installation and Operation Manual
1-8 System Application Considerations LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2
1.4 System Application Considerations
Routing to the Composite Channels
The LS-6N module has a single internal port, which connects the composite data
stream of the module to the TDM buses. The LS-12 module has two internalports, which connect the composite data stream(s) of the module to the TDM
buses. The functionality of the two ports can be independently controlled:
External (user) ports can be routed to either of the two internal ports. The
only restriction is that the two ports of a pair are always routed together, to
the same internal port. Therefore, all the twelve user ports can be routed to
the same internal port.
Each internal port can routed to either of the Megaplex uplink ports.
The LS-6N module has a single internal port, which connects the composite data
stream of the module to the TDM buses. The internal port can be routed to any
Megaplex TDM bus or uplink.
Each internal port can use the following uplink bandwidths:
14.4 kbps, requires the allocation of quarter E1/T1 timeslot.
32 kbps, requires the allocation of half E1/T1 timeslot.
56 kbps, requires the allocation of one E1/T1 timeslot.
64 kbps, requires the allocation of one E1/T1 timeslot.
128 kbps, requires the allocation of two E1/T1 timeslots.
192 kbps, requires the allocation of three E1/T1 timeslots.
256 kbps, requires the allocation of four E1/T1 timeslots.
384 kbps, requires the allocation of six E1/T1 timeslots.
512 kbps, requires the allocation of eight E1/T1 timeslots.
768 kbps, requires the allocation of twelve E1/T1 timeslots.
The selection of the optimal E1/T1 bandwidth depends on the total users
payload rate, as is explained in the following section.
Timeslots can be freely allocated to each internal port, in accordance with the
standard timeslot allocation rules (e.g., timeslots allocated to one internal port
must not overlap timeslots allocated to the other port, or any other module in
the Megaplex unit).
The timeslots allocated to each internal port must always be handled as a bundle(a single block of timeslots) with respect to the routing within the transmission
network. Splitting the bundle may affect the order of reception of the individual
bits at the remote location, and therefore may prevent the operation of the
LS-6N/12 link by disrupting the exchange of housekeeping and synchronization
information contained in the composite data stream.
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Installation and Operation Manual Chapter 1 Introduction
LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2 System Application Considerations 1-9
Bandwidth Allocation
The Megaplex uplink bandwidth assigned to an LS-6N, LS-12 composite data
stream (internal port) must be internally allocated to the individual user channels
routed to that port, and to the housekeeping information required for proper
transmission and reception of each composite data stream.
Each composite channel data stream carries two basic types of information: Users data, consisting of:
External channels payload data.
External channels end-to-end signaling.
Composite channel housekeeping data, consisting of:
Frame synchronization data for the link between the two module ports.
Inband management channel.
The technique used to manage the composite channel bandwidth is permanent
on-demand allocation. This means that within the module, bandwidth is
permanently allocated to the external channels connected to a compositechannel, in accordance with each external channel data rate and the end-to-end
signaling requirements. The internal bandwidth is automatically reallocated when
a change occurs in the number of users channels connected to a composite
channel.
The bandwidth that must be assigned to a composite channel on the
corresponding Megaplex TDM bus (i.e., E1/T1 card) must be equal to, or greater
than, the total bandwidth needed for carrying the various types of information
listed above.
Bandwidth allocation is performed by organizing the composite data stream in
frames. Each bit in a frame can be independently allocated, and therefore it
serves as the bandwidth allocation unit. Therefore, the total number ofbandwidth allocation units equals the frame length, in bits.
As a result, the frame length and the information-carrying capacity (in kbps) of
an allocation unit vary with the uplink bandwidth assigned to an LS-6N, LS-12
composite channel, as listed in Table 1-1.
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Chapter 1 Introduction Installation and Operation Manual
1-10 System Application Considerations LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2
Table 1-1. Composite Channel Multiplexing Data
Assigned Bandwidth Composite
Frame Length
Bandwidth
Allocation Unit
Bandwidth Available to
Users Payload
14.4 kbps 40 bits 0.4 kbps 12.8 kbps (36 units)
32 kbps 80 bits 0.4 kbps 31.2 kbps (78 units)
56 kbps 70 bits 0.8 kbps 54.4 kbps (68 units)
64 kbps 80 bits 0.8 kbps 62.6 kbps (78 units)
128 kbps 160 bits 0.8 kbps 126.6 kbps (158 units)
192 kbps 160 bits 0.8 kbps 190.4 kbps (238 units)
256 kbps 160 bits 1.6 kbps 252.8 kbps (158 units)
384 kbps 240 bits 1.6 kbps 381.8 kbps (238 units)
512 kbps 160 bits 3.2 kbps 505.6 kbps (158 units)
768 kbps (LS-12 only) 240 bits 3.2 kbps 761.6 kbps (238 units)
Table 1-2provides detailed bandwidth allocation information for each supported
channel data rate, as a function of assigned bandwidth. Note that the supported
channel rates depend on the assigned bandwidth.
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Installation and Operation Manual Chapter 1 Introduction
LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2 System Application Considerations 1-11
Table 1-2. Bandwidth Allocations
Use Allocation Units Allocation Rule
Synchroniza-
tion
1
Inband
management
1
Data
Channels
Channel
Rate
(kbps)
Composite Channel Rate (kbps) In accordance with channel data
rate.
14.4 32 56, 64,
128, 192
256,
384
512, 768 Theoretical minimum is one
allocation unit per active
channel, however for low data
2.4
4.8
7.2
8
9.6
14.4
16
19.2
24
28.8
32
38.4
48
56
57.6
64
6
12
18
20
24
6
12
18
20
24
36
40
48
60
72
3
6
9
10
12
18
20
24
30
36
40
48
60
70
72
80
3
3
N/A
5
6
9
10
12
15
18
20
24
30
35
36
40
3
3
N/A
N/A
3
N/A
5
6
N/A
9
10
12
15
N/A
18
20
rate (i.e., for data rates lower
than the bandwidth allocation
unit), oversampling is used to
achieve an integer number of bitsamples: e.g., when the
bandwidth allocation unit is
3.2 kbps and the channel data
rate is 2.4 kbps, the effective
bandwidth being used is 3 times
higher, 9.6 kbps. 9.6 kbps
translate to 3 allocation units.
Therefore, the effect of
oversampling is to increase the
bandwidth used to transfer
low-rate channels.
64 kbps rate is available only for
uplink rates of 128 kbps and
higher
Channel
end-to-end
control
signals
1 allocation unit for each pair of channels (1 allocation
unit can carry up to four control signals, e.g., two
signals for each channel)
For each data channel that
requires end-to-end signaling
Numerical Example
The following two numerical examples illustrate how to use the above table
information from to calculate the internal channel bandwidth required for variousoperating configurations.
In the first example (see Table 1-3), all the six channels of an LS-6N module are
used, and are connected to the composite channel. In the second example (see
Table 1-4), all the 12 channels of an LS-12 module are used, and are connected
to one composite channel. In both cases, the Megaplex uplink bandwidth
assigned to the composite channel is 256 kbps (160 bits).
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Chapter 1 Introduction Installation and Operation Manual
1-12 Technical Specifications LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2
Table 1-3. Bandwidth Allocations Example, LS-6N
Utilization Allocation Units
4 data channels with 14.4 kbps per channel; these
channels (distributed among two channel pairs) require
end-to-end signaling
36 units
2 units signaling
2 data channels with 32 kbps per channel, no end-to-end
signaling
40 units
Total user allocation 78 units
Frame synchronization and management channel 2 units
Total capacity used 80 units
Reserve capacity
[composite channelassigned bandwidth of 256 kbps less
total capacity used]
80 units (128 kbps)
[160 units - 80 units =
80 units]
Table 1-4. Bandwidth Allocations Example, LS-12
Utilization Allocation Units
10 data channels with 14.4 kbps per channel; seven of
these channels (distributed among four channel pairs)
require end-to-end signaling
90 units
4 units signaling
2 data channels with 32 kbps per channel, no end-to-end
signaling
40 units
Total user allocation 134 units
Frame synchronization and management channel 2 units
Total capacity used 136 units
Reserve capacity 24 units (38.4 kbps)
1.5 Technical Specifications
Number of User
Channels (ExternalPorts)
6/12 channels, processed as 6/12 pairs (1 and 2, 3 and
4, 5 and 6, 7 and 8, 9 and 10, 11 and 12)
Number of
Composite Channels
(Internal Ports)
LS-6N: One, routable to either of the Megaplex uplink
ports
LS-12: Two, each independently routable to either of
the Megaplex uplink ports
Uplink Bandwidth 14.4 kbps (quarter timeslot)
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Installation and Operation Manual Chapter 1 Introduction
LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2 Technical Specifications 1-13
Requirements 32 kbps (half timeslot)
56 kbps (one timeslot)
64 kbps (one timeslot)
128 kbps (two timeslots)
192 kbps (three timeslots)
256 kbps (four timeslots)
384 kbps (six timeslots)
512 kbps (eight timeslots)
768 kbps (twelve timeslots)
Channel Multiplexing
Technique
Each pair of external channels can be independently
connected to each internal port
Configuration Programmable via system management
Data ChannelInterface Type
ITU-T Rec. V.24/EIA RS-232, user-selectable DCE or DTEinterface
Operation Mode Synchronous or asynchronous, user-selectable
Async-to-Sync
Conversion Method
Compatible with ITU-T Rec. V.14
Synchronous
Operation Timing
Modes
DCE (for direct connection to DTE)
External DCE (for direct connection to DCE in the
tail-end mode)
DTE (for direct connection to DCE)
Asynchronous Word
Parameters
Number of Data
and Parity Bits
Total of 6, 7, 8 or 9, user-selectable
Parity Bit Transparently transferred
Stop Bits 1
Data ChannelConnectors One SCSI 68-pin female connector for each group of sixchannels
Data Rates Independently selectable for each channel, except that
the two channels of one pair must use rates from the
same group
Group 1 2400, 4800, 9600, 19200 and 38400 bps in either
synchronous or asynchronous mode
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1-14 Technical Specifications LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2
Group 2 7.2, 14.4, 28.8, and 57.6 kbps in either synchronous or
asynchronous mode
Group 3 8, 16, 24, 32, 48, 56, and 64 kbps in synchronous mode
only
Control Signals Support mode is user-selectable for each channel
Local Support RTS, CTS, DSR, DCD, DTR
End-to-End
Transfer
Selectable:
RTS-to-DCD (2.5 msec typical delay)
RTS-to-DCD and DTR-to-DSR (2.5 msec typical delay)
Composite Data
Streams
Local digital loopback on the selected composite data
stream
Remote digital loopback on the selected composite
data stream
Data Channels Local digital loopback
Remote digital loopback
Bit error rate testing (BERT) on the selected channel
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LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2 Setting the Internal Jumpers and Switches 2-1
Chapter 2
Installation and Operation
2.1 Introduction
This chapter provides installation, configuration and operation instructions for
the LS-6N and LS-12 modules. The information presented in this chapter
supplements the general installation, configuration and operation instructions
contained in the corresponding Megaplex Installation and Operation Manual.
Before performing any internal settings, adjustment, maintenance, or repairs,
first disconnect all the cables from the module, and then remove the modulefrom the Megaplex enclosure.
No internal settings, adjustment, maintenance, and repairs may be performed by
either the operator or the user; such activities may be performed only by a skilled
technician who is aware of the hazards involved.
Always observe standard safety precautions during installation, operation, and
maintenance of this product.
The modules contain components sensitive to electrostatic discharge (ESD). To
prevent ESD damage, always hold the module by its sides, and do not touch the
module components or connectors.
2.2 Setting the Internal Jumpers and Switches
The operating mode of the LS-6N, LS-12 modules is controlled by software.
In addition, the modules have switches that select the interface mode of each
channel: DTE or DCE. Default setting is DCE.
When selecting the data channel timing reference, observe the following DTE/DCE
switch settings:
DCE clock mode: the DTE/DCE switch is set to DCE. DTE or External DCE clock mode: the DTE/DCE switch is set to DTE.
Refer toTable 3-2for details on the external port configuration parameters.
Figure 2-1 shows the construction of the LS-12 modules, and identifies the
location of these switches (12 switches, one for each channel). The LS-6N
module differs only in that it contains 6 channels.
Before installing a module in the Megaplex enclosure, check the settings of these
switches. If the current settings of these switches meet your system
requirements, skip this section and proceed with the module installation in the
Warning
Caution
Note
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Chapter 2 Installation and Operation Installation and Operation Manual
2-2 Connecting the Cables LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2
Megaplex enclosure, as explained below; otherwise, change the switch settings as
required.
SW1 SW13
SW2 SW14
SW3 SW15
SW4 SW16
SW5 SW17
SW6 SW18
SW7 SW19
SW8 SW20
SW9 SW21
Interface Mode
Selection
DCE
DTE
DTE
DCE
Channel 1
Channel 2
Channel 12
.
.
.
.
.
.
.
.
.
.
.
.
.SW12 SW24
SW10 SW22
SW11 SW23
Figure 2-1. Module LS-12, Internal Settings
2.3 Installing the Module in the Chassis
Refer to the system installation plan, and insert the module in the assigned I/O
slot of the Megaplex enclosure.
2.4 Connecting the Cables
For direct connection to users data equipment, RAD offers ready-made octopus
cables, CBL-LS12, having a length of 2m. These cables end in six 25-pin D-type
male connectors that can be directly connected to DTE's.
Connect one cable end to the module connectors, designated
CH.1-6 and CH.7-12, respectively, and the other end straight to the DTE
equipment.
Appendix A lists the pin assignment both of the module connector and the
CBL-LS12 cable.
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LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2Configuration Sequence for the MP-2100/2104
Chassis 3-1
Chapter 3
Configuration
3.1 Overview
This chapter describes configuration parameters specific for LS-6N, LS-12
modules installed in the Megaplex-2100 or Megaplex-4100 chassis. For general
instructions and additional configuration procedures, refer to
Megaplex-2100/2104 Installation and Operation Manualand Megaplex-4100
Installation and Operation Manual, respectively.
The module is configured by the management system used to control the
Megaplex unit:
Supervision terminal or Telnet refer to the Megaplex-2100/2104or
Megaplex-4100 Installation and Operation Manualfor instructions.
Web browser refer to the Megaplex-4100 Installation and Operation Manual
for instructions.
RADview network management system refer to the RADview User's Manual
for instructions.
3.2 Configuration Sequence for the MP-2100/2104Chassis
Add an LS-6N, LS-12 module not yet installed in the Megaplex-2100/2104
chassis to the database. This allows preconfiguring the module parameters,
so that the module will immediately start operating in the desired mode as
soon as it is installed in the enclosure. For the supervision terminal, use the
DEF SYS command
Configure the LS-6N, LS-12 internal and external port parameters:
To define the parameters of all the module ports for the supervision
terminal, type the command:
DEF CH SS *
To define the parameters of an internal port, type the command:
DEF CH SS IN1 or DEF CH SS IN2
For the parameter description, see Table 3-1.
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Chapter 3 Configuration Installation and Operation Manual
3-2 LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2
To define the parameters of an external port, type the command:
DEF CH SS CC
where SS is the slot number, and CC is the channel number (1 to 6 for LS-6N
and 1 to 12 for LS-12). For the parameter description, see Table 3-2.
3.3 Configuration Sequence for the MP-4100
Chassis
1. Add an LS-6N, LS-12 module not yet installed in the Megaplex-4100 chassis
to the database. This allows preconfiguring the module parameters, so that
the module will immediately start operating in the desired mode as soon as it
is installed in the enclosure.
For the supervision terminal, use the
screen.
Configure the CL.1 or M8E1/M8T1/M8SL module port parameters (depending
on the LS-6N, LS-12 module application). For the configuration procedure,
refer to the appropriate Installation and Operation Manual.
Configure the LS-6N, LS-12 internal port parameters. For the supervision
terminal, use the screen.
Configure the LS-6N, LS-12 external port parameters. For the supervision
terminal, use the screen.
When necessary, modify the system timing reference to use the receive clock
of a LS-6N, LS-12 port as timing reference. For the supervision terminal, use
the screen (for instructions, refer to theMegaplex-4100 Installation and Operation Manual).
Configure the rate of each module port, using the
screen.
Make sure to plan ahead the configuration sequence, because Megaplex-4100
databases can be updated only after correctly completing the configuration
activities: any sanity error will prevent saving the changes to the database being
modified.
3.4 Configuration Parameters
The LS-6N, LS-12 modules have two groups of configuration parameters:
Internal port parameters, used to define the characteristics of composite
channels. These parameters are listed in Table 3-1.
External port parameters, used to define the data channel parameters. These
parameters are listed in Table 3-2.
Note
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Installation and Operation Manual Chapter 3 Configuration
LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2 3-3
For system application considerations and background information regarding the
selection of configuration parameters, refer to Chapter 1.Table 3-1 explains the internal port parameters and their range of values.
Table 3-2explains the external port parameters and their range of values.
Table 3-1. Internal Port Parameters
Parameter Description
(MP-2100/2104 only)
Determines whether the corresponding composite channel is connected to the
main link:
Composite channel is connected to the main link selected by means of
the field.Composite channel is disconnected. You can still program the desired
parameters, so the composite channel will be ready to operate when
needed
(MP-4100 only)
Used to enable/disable the flow of traffic through the selected port
The flow of traffic is enabled.
The flow of traffic is disabled. This state should be selected as long as
the port configuration has not yet been completed, or when it is
necessary to stop traffic flow through the port.
Specifies the bandwidth allocated to the corresponding composite channel on the
Megaplex uplink selected by means of the field:
14.4 kbps (quarter timeslot)
32 kbps (half timeslot)
56 kbps (one timeslot)
64 kbps (one timeslot) 128 kbps (two timeslots)
192 kbps (three timeslots)
256 kbps (four timeslots)
384 kbps (six timeslots)
512 kbps (eight timeslots)
768 kbps (twelve timeslots)
Future option, the only available value is .
Selects the operation mode:
Bidirectional (regular) mode Unidirectional broadcast transmit mode
Unidirectional broadcast receive mode
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Chapter 3 Configuration Installation and Operation Manual
3-4 LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2
Parameter Description
(MP-2100/2104 only)
Selects the I/O slot number of the destination main link module:
When using the or modes, you can select the desired I/O
slot.
When using the mode, this field automatically changes to , to
remind you that the destination port must be selected using the DEF TS
command.
(MP-2100/2104 only)
Selects the number of the main link port on the selected destination main link
module:
When using the or mode, you can select the desired
external port number. The supported range depends on the number of external
ports available on the main link module installed in the slot selected by the
parameter.
When using the mode, this field automatically changes to , to
remind you that the destination port must be selected using the DEF TS
command.
(MP-4100 only)
Specifies the module (I/O slot) to which the data stream handled by the port is
routed. The available selections are the CL.1 modules installed in the chassis, and
I/O modules IO-1 to IO-10.
When using the mode in MP-2100/2104, this field automatically
changes to , to remind you that the destination port must be selected using
the command. In MP-4100, the destination slot and port are not defined
for this mode.
(MP-4100 only)Specifies the port to which the data stream handled by the port is routed.The available selections are 1 to 8 for external ports, or 1 to 63 (1 to 84) for
internal (virtual) ports (actual range depends on the destination module).
Default: None
When using the mode in MP-2100, this field automatically changes to
, to remind you that the destination port must be selected using the
command. In MP-4100, the destination slot and port are not defined for this
mode.
Selects the timeslot mapping method when the destination is a E1/T1 port using
the legacy service mode ( ):
When using the or mode for a module installed in a
MP-2100 chassis, this field automatically changes to , to remind you that
the destination must be selected using the DEF TS command. When the
module is installed In a MP-4100 chassis, this field does not appear.
When using the mode, you can select the desired mode:
You can select the desired uplink timeslots on the timeslot map.
The external port is assigned consecutive timeslots, starting with
the timeslot specified by means of the parameter.
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Installation and Operation Manual Chapter 3 Configuration
LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2 3-5
Parameter Description
Selects the starting timeslot in the frame of the destination E1/T1 port.
This parameter can be selected only when using the mapping mode; when
using any other mode, this field automatically changes to .
The allowed range is 1 to 31 for E1 ports, and 1 to 24 for T1 ports.
Table 3-2. External Port Parameters
Parameter Description
(MP-2100/2104
only)
Determines whether the corresponding port will be connected to a composite channel:
Channel is connected to the composite channel selected by means of the field
Channel is disconnected. You can still program the desired parameters, so the
channel will be ready to operate when needed
Used to enable/disable the flow of traffic through the selected port:
The flow of traffic is enabled.
The flow of traffic is disabled. This state should be selected as long as the port
configuration has not yet been completed, or when it is necessary to stop
traffic flow through the port.
Selects the protocol used by the data channel being configured:
Asynchronous operation
Synchronous operation
Rate Determines the channel data rate, in kbps.
Group 1: 2.4, 4.8, 9.6, 19.2, 38.4
Group 2: 7.2, 14.4, 28.8, 57.6
Group 3: 8.0, 16.0, 24.0, 32.0, 48.0, 56.0, 64.0
: Both channels of a given pair must operate at rates belonging to the same group. Group 3 rates can be
selected only on channels using the synchronous protocol.
Selects the data channel timing mode. Applicable only if the SYNC protocol has been
selected. For a description of channel timing modes, refer to the MP-2100/2104Installation and Operation Manual.
The channel interface operates as a DCE, and provides transmit and receive
clocks to the synchronous user DTE.
The channel interface supplies the receive clock to the users equipment
and accepts the user transmit clock.
The channel interface requires transmit and receive clock signals from
the users equipment.
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Chapter 3 Configuration Installation and Operation Manual
3-6 LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2
Parameter Description
: When selecting the data channel timing reference, set the interface module DTE/DCE switches as follows:
DCE clock mode: the DTE/DCE switch is set to DCE
DTE or External DCE clock mode: the DTE/DCE switch is set to DTE.
For details on the interface module internal switches settings, refer toSection 2.2.
(MP-2100/2104)
(MP-4100)
Determines the handling of control signals by the data channel:
End-to-end transmission of control signals is disabled. Only local support is
enabled
The state of the local RTS line is transmitted to the remote DCD line.
The state of the local RTS line is transmitted to the remote DCD line, and
the state of the local DTR - to the remote DSR line.
: Both channels of a given pair must be assigned to support the matching control signals.
Selects the state of the local CTS line:
CTS line is constantly ON.CTS line follows the state of RTS line.
Selects the number of data bits. Applicable only if the ASYNC protocol has beenselected.
9
8
7
6
Total number of data and parity bits
(MP-2100)
(MP-4100)
Selects the composite channel to which the corresponding external port will be
connected:
The corresponding channel is connected to internal port 1.
The corresponding channel is connected to internal port 2 (LS-12 only).
: Both channels of a given pair must be connected to the same internal composite channel.
3.5 Assigning Timeslots
After performing the configuration of the individual module channels, it is
necessary to assign uplink bandwidth to each connected channel.
When using the or mode in the module installed in the
MP-2100/2104 chassis, use the command to assign timeslots, and
the to assign a fraction of a timeslot, as explained in the
Megaplex-2100/2104 Installation and Operation Manual.
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Installation and Operation Manual Chapter 3 Configuration
LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2 3-7
When using the mode in the module installed in the
MP-2100/2104 chassis, timeslot assignment for the receive direction is made
using the dedicated routing fields of the command.
For the module installed in the MP-4100 chassis, always use the
screen, as explained in the
Megaplex-4100 Installation and Operation Manual.
3.6 Displaying Status and Configuration
Information
The Megaplex-2100/2104user can read the LS-6N, LS-12 status and
configuration information using the command. For a general
description of this command, refer to Appendix Fof the Megaplex-2100/2104
Installation and Operation Manual.
The command includes two sections:
: displays the timing mode of each channel at the
time the command has been received by the module.
: displays a data form similar to that displayed by the
command, showing the current configuration of each external and
internal port. For a description of the displayed parameters, refer to
Table 3-1 and Table 3-2.
The Megaplex-4100user can read the LS-6N, LS-12 status and configuration
information using the screen, for every slot
and link of the I/O or CL.1 module to which the LS-6N, LS-12 timeslots have been
assigned. A typical subscreen is
. For a general description of this menu, referto Chapter 4of the Megaplex-4100 Installation and Operation Manual.
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LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2 Test and Diagnostic Functions 4-1
Chapter 4
Troubleshooting and
Diagnostics
This chapter explains the specific tests and diagnostic functions of the LS-6N and
LS-12 modules and provides troubleshooting instructions.
For a description of the alarm and configuration (sanity) error messages
generated by LS-6N, LS-12 modules, refer to Appendix Bof the
Megaplex-2100/2104 Installation and Operation Manualor Chapter 5of the
Megaplex-4100 Installation and Operation Manual.
The diagnostic information presented in this chapter supplements the generaldiagnostics and troubleshooting information instructions contained in the
corresponding Megaplex Installation and Operation Manual.
4.1 Test and Diagnostic Functions
In addition to the two front panel alarm indicators, the LS-6N, LS-12 modules
have a complete set of test and loopback functions that includes two levels:
Composite data streams generated by the module (the data streams sent to
the main link)
Individual data channels.
When a test or loopback is activated, the user can also specify the time it remains
active: the range is 1 through 30 minutes, in 1-minute steps. After the specified
time, the test or loopback is automatically deactivated by the module, thereby
reducing the management workload during system troubleshooting. The default
selection is continuous connection, that is, the test or loopback remains active
until canceled by a user's command. The following sections describe the available
diagnostic activities.
Composite Data Stream Loopback Functions
The LS-6N, LS-12 modules support the local digital and remote digital loopbacks
on the composite data stream.
To activate a test on a composite data stream in a LS-6N, LS-12 module
installed in a MP-2100/2104 chassis, use the or
command (where SS is the slot number and X is the internal port number
(1 or 2), and then select the local/remote loopback, as described in the
Megaplex-2100/2104 Installation and Operation Manual.
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Chapter 4 Troubleshooting and Diagnostics Installation and Operation Manual
4-2 Test and Diagnostic Functions LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2
To activate a test on a composite data stream in a LS-6N, LS-12 module
installed in a MP-4100 chassis, use the
menu, and then select the local or remote loopback, as described in the
Megaplex-4100 Installation and Operation Manual.
Composite Data Stream Local Digital Loopback
When a local loop is activated on the LS-6N, LS-12 composite data stream, the
module composite transmit signal is returned to its receive path. As a result, eachindividual channel receives its own signal.
The composite transmit signal is still connected to the transmit path and reaches
the LS-12 module installed in the remote Megaplex unit, therefore the remote
equipment does not lose synchronization.
While the loop is connected, all the local users connected to the module must
receive their own signals, and the S.LOSS indicators of the local module must be
off. This loopback provides a quick operational check of the local module. The
loopback signal path is shown in Figure 4-1.
Composite Data Stream Remote Digital Loopback
When a remote composite data stream loopback is activated, the LS-12 module
loops back the receive signal toward the remote equipment. The received signal
remains connected as usual to the receive path of the local module, and
therefore the local S.LOSS indicates must be off. The loopback signal path is
shown in
Figure 4-2.
While the loop is connected, and the link to the remote equipment operates
normally, all the users connected to the remote module must receive their own
signals, and the S.LOSS indicators of the modules must be off.
This loop allows the user to perform a quick operational check of the end-to-end
transmission via this module.
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Installation and Operation Manual Chapter 4 Troubleshooting and Diagnostics
LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2 Test and Diagnostic Functions 4-3
LS-12
I/OM
ODULES
LS-12
I/OMODULES
Local Unit
SystemManagement
Remote Unit
User or
Test
Equipment
User or
Test
Equipment
Channel 1
Channel 2...
.
.
.
....
Channel 12
Figure 4-1. Composite Local Loopback, Signal Path
LS-12
I/OM
ODULES
LS-12
I/OMODULES
Local Unit
System
Management
Remote Unit
User or
TestEquipment
User orTest
Equipment
Channel 1
Channel 2...
.
.
.
....
Channel 12
Figure 4-2. Composite Remote Loopback, Signal Path
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Chapter 4 Troubleshooting and Diagnostics Installation and Operation Manual
4-4 Test and Diagnostic Functions LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2
Data Channel Stream Loopback Functions
The LS-6N, LS-12 modules support the following test and loopback functions on
the individual data channels:
Local digital loopback
Remote digital loopback
Bit error rate testing (BERT) on a selected data channel.
The tests are activated as follows:
To activate a test in a LS-6N, LS-12 module installed in a MP-2100/2104
chassis, use the or command (where SS is
the slot number and X is the internal port number (1 or 2), and then select
the local/remote loopback or BERT, as described in the Megaplex-2100/2104
Installation and Operation Manual.
To activate a test in a LS-6N, LS-12 module installed in a MP-4100 chassis,
use the menu, and then select the
local or remote loopback, as described in the Megaplex-4100 Installation andOperation Manual.
Data Channel Local Digital Loopback
The local channel loop is performed within the channel user interface, by
returning the transmit signal arriving from the user on the receive path. The
transmit signal remains connected to the transmit path and reaches the remote
user.
The loop signal path is shown in Figure 4-3. This loopback provides a quick
operational check of the connections between the user equipment and the LS-
6N, LS-12 channel.
LS-12
I/OM
ODULES
LS-12
I/OMODULES
Local Unit
System
Management
Remote Unit
User or
Test
Equipment
User or
Test
Equipment
Channel 1
Channel 2...
.
.
.
....
Figure 4-3. Data Channel Local Digital Loopback, Signal Path
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Installation and Operation Manual Chapter 4 Troubleshooting and Diagnostics
LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2 Test and Diagnostic Functions 4-5
Data Channel Remote Digital Loopback
The remote channel loopback is performed by returning the signal received from
the remote user on the transmit path. The received signal remains connected as
usual to the receive path of the local channel.
The loopback signal path is shown in Figure 4-4. This loopback allows the user to
perform a quick operational check of the end-to-end transmission via this channel.
LS-12
I/OM
ODULES
LS-12
I/OMODULES
Local Unit
System
Management
Remote Unit
User or
Test
Equipment
User or
Test
Equipment
Channel 1
Channel 2
.
.
...
.
....
Figure 4-4. Data Channel Remote Digital Loopback, Signal Path
BER Testing on Data Channels
The BER test checks proper data transmission through the path serving theselected LS-6N, LS-12 channel, to obtain a qualitative evaluation of data
transmission without using external test equipment.
The bit error rate is measured by applying a 511-bit pseudo-random test
sequence, generated by an on-board generator, to the input of the channel
transmit path. The transmitted data is returned by means of a loop somewhere
along the data path (e.g., by connecting a local or remote loopback) to the
receive path of the channel, and routed to a test sequence evaluator. Instead of
using a loopback, it is also possible to activate the BERT at both ends of the link,
because the same data patterns are used at both ends. The evaluator compares
the received data, bit by bit, to the original data and detects any difference (bit
error). The output of the evaluator is sampled during module polling, to checkwhether errors were detected in the interval between consecutive pollings. The
total number of intervals during which errors were detected are counted and can
be displayed to the operator. Only one BER test can be performed on the module
at any time.
The BER test is not supported by the MP-4100 chassis.Note
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Chapter 4 Troubleshooting and Diagnostics Installation and Operation Manual
4-6 Frequently Asked Questions LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2
Recommended Test Sequence
The tests and loops available on the LS-6N, LS-12 modules provide a rapid and
efficient way to identify the general location of a fault at either the module, or in
the external equipment serving the module channels. The following instructions
refer to local and remote units on the assumption that the system includes
one system management, which is connected to the local unit.
Use the following sequence of tests:
Step Action Interpretation of Results
1 Activate local composite data stream loops at
both the remote and local LS-6N, LS-12
modules
A fault indication at either side means that the
corresponding LS-6N, LS-12 module is faulty
2 Deactivate the local composite data stream
loops
Not applicable
3 Activate a local channel loop on the side that
reports a channel problem
The equipment connected to the channel should
receive its own signal correctly. If not, the
problem is with the equipment and/or its
connections to the LS-6N/12 module
4 Deactivate the channel loop Not applicable
4.2 Frequently Asked Questions
The delay through the MP-2100/2104 is:
2.4 kbps = 35 msec
4.8 kbps = 17 msec
9.6 kbps = 10 msec
The LS-12 module must work opposite another LS-12 module or LS-6N
module (which is basically the same module, but with only 6 data
channels).
No. LS-6N can work only in point-to-point mode. Configuration data for
external ports must be sent as a bundle to a single main link port and
opened at the remote side. To enable point-to-multipoint configuration,
you can use an LS-12 module. This 12-port module allows sending data to
two different sites.
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Installation and Operation Manual Chapter 4 Troubleshooting and Diagnostics
LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2 Technical Support 4-7
Yes, they do. All the differences between the two module locations are
purely chassis/common logic related (command line vs menu interface,
main link vs CL or I/O ports as timeslot destinations, etc.) The only module-
level difference is that the BER Test is currently not supported in the
Megaplex-4100 chassis.
4.3 Technical Support
Technical support for this product can be obtained from the local distributor from
whom it was purchased.
For further information, please contact the RAD distributor nearest you or one of
RAD's offices worldwide. This information can be found at www.rad.com (offices
About RAD > Worldwide Offices; distributors Where to Buy > End Users).
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Chapter 4 Troubleshooting and Diagnostics Installation and Operation Manual
4-8 Technical Support LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2
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LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2 Data Channel Connectors A-1
Appendix A
Pinouts
A.1 Data Channel Connectors
The LS-12 user data channels terminate in two 68-pin female SCSI connectors
designated CH.1-6 and CH.7-12. LS-6N includes only one connector designated
CH.1-6. Table A-1 lists theconnectors pin allocations. Note that the direction of
control signals depends on the channel interface mode.
Table A-1. CH.1-6 and CH.7-12 Connectors, Pin Assignment
1 - - Frame Ground, all channels
2 1 7 Transmit data, channel 1 (7) In Out
3 1 7 External transmit clock, channel 1 (7) In Out
4 1 7 Data carrier detect, channel 1 (7) Out In
5 1 7 Data set ready, channel 1 (7) Out In
6 1 7 Clear to send, channel 1 (7) Out In
7 2 8 Transmit data, channel 2 (8) In Out
8 2 8 External transmit clock, channel 2 (8) In Out
9 2 8 Data carrier detect, channel 2 (8) Out In
10 2 8 Data set ready, channel 2 (8) Out In
11 2 8 Clear to send, channel 2 (8) Out In
12 3 9 External receive clock, channel 3 (9) In Out
13 3 9 Transmit data, channel 3 (9) In Out
14 3 9 External transmit clock, channel 3 (9) In Out
15 3 9 Data carrier detect, channel 3 (9) Out In
16 3 9 Data set ready, channel 3 (9) Out In
17 3 9 Clear to send, channel 3 (9) Out In
18 4 10 Transmit data, channel 4 (10) In Out
19 4 10 External transmit clock, channel 4 (10) In Out
20 4 10 Data carrier detect, channel 4 (10) Out In
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Appendix A Pinouts Installation and Operation Manual
A-2 Data Channel Connectors LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2
21 4 10 Data set ready, channel 4 (10) Out In
22 4 10 Clear to send, channel 4 (10) Out In
23 5 11 External receive clock, channel 5 (11) In Out24 5 11 Transmit data, channel 5 (11) In Out
25 5 11 External transmit clock, channel 5 (11) In Out
26 5 11 Data carrier detect, channel 5 (11) Out In
27 5 11 Data set ready, channel 5 (11) Out In
28 5 11 Clear to send, channel 5 (11) Out In
29 6 12 Transmit data, channel 6 (12) In Out
30 6 12 External transmit clock, channel 6 (12) In Out
31 6 12 Data carrier detect, channel 6 (12) Out In
32 6 12 Data set ready, channel 6 (12) Out In
33 6 12 Clear to send, channel 6 (12) Out In
34 6 12 External receive clock, channel 6 (12) In Out
35 1 7 Receive clock, channel 1 (7) Out In
36 1 7 Request to send, channel 1 (7) In Out
37 1 7 Receive data, channel 1 (7) Out In
38 1 7 Transmit clock, channel 1 (7) Out In
39 1 7 Data terminal ready, channel 1 (7) In Out
40 1 7 External receive clock, channel 1 (7) In Out
41 2 8 Receive clock, channel 2 (8) Out In
42 2 8 Request to send, channel 2 (8) In Out
43 2 8 Receive data, channel 2 (8) Out In
44 2 8 Transmit clock, channel 2 (8) Out In
45 2 8 Data terminal ready, channel 2 (8) In Out
46 2 8 External receive clock, channel 2 (8) In Out
47 3 9 Receive clock, channel 3 (9) Out In
48 3 9 Request to send, channel 3 (9) In Out
49 3 9 Receive data, channel 3 (9) Out In
50 3 9 Transmit clock, channel 3 (9) Out In
51 3 9 Data terminal ready, channel 3 (9) In Out
52 4 10 Receive clock, channel 4 (10) Out In
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Installation and Operation Manual Appendix A Pinouts
LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2 Octopus Cable A-3
53 4 10 Request to send, channel 4 (10) In Out
54 4 10 Receive data, channel 4 (10) Out In
55 4 10 Transmit clock, channel 4 (10) Out In56 4 10 Data terminal ready, channel 4 (10) In Out
57 4 10 External receive clock, channel 4 (10) In Out
58 5 10 Receive clock, channel 5 (11) Out In
59 5 10 Request to send, channel 5 (11) In Out
60 5 10 Receive data, channel 5 (11) Out In
61 5 10 Transmit clock, channel 5 (11) Out In
62 5 10 Data terminal ready, channel 5 (11) In Out
63 6 12 Receive clock, channel 6 (12) Out In
64 6 12 Request to send, channel 6 (12) In Out
65 6 12 Receive data, channel 6 (12) Out In
66 6 12 Transmit clock, channel 6 (12) Out In
67 6 12 Data terminal ready, channel 6 (12) In Out
68 Signal ground, all channels
A.2 Octopus Cable
RAD offers special octopus cables that end in six 25-pin D-type male connectors,
and can be used to connect directly the LS-6N, LS-12 data channels to DTE
equipment. Table A-2lists the connections between the pins of the 68-pin SCSI
connector, which connect to the CH.1-6 or CH.7-12 connector of the
LS-6N, LS-12 module, and the pins in the six user-side connectors of the cable.
Table A-2. CBL-LS12 Octopus Cable Wiring
1 Frame Ground, all channels All connectors, pin 1
2 Transmit data, channel 1 (7) Connector 1 (7), pin 2
3 External transmit clock, channel 1 (7) Connector 1 (7), pin 24
4 Data carrier detect, channel 1 (7) Connector 1 (7), pin 8
5 Data set ready, channel 1 (7) Connector 1 (7), pin 6
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Appendix A Pinouts Installation and Operation Manual
A-4 Octopus Cable LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2
6 Clear to send, channel 1 (7) Connector 1 (7), pin 5
7 Transmit data, channel 2 (8) Connector 2 (8), pin 2
8 External transmit clock, channel 2 (8) Connector 2 (8), pin 24
9 Data carrier detect, channel 2 (8) Connector 2 (8), pin 8
10 Data set ready, channel 2 (8) Connector 2 (8), pin 6
11 Clear to send, channel 2 (8) Connector 2 (8), pin 5
12 External receive clock, channel 3 (9) Connector 3 (9), pin 11
13 Transmit data, channel 3 (9) Connector 3 (9), pin 2
14 External transmit clock, channel 3 (9) Connector 3 (9), pin 24
15 Data carrier detect, channel 3 (9) Connector 3 (9), pin 8
16 Data set ready, channel 3 (9) Connector 3 (9), pin 6
17 Clear to send, channel 3 (9) Connector 3 (9), pin 5
18 Transmit data, channel 4 (10) Connector 4 (10), pin 2
19 External transmit clock, channel 4 (10) Connector 4 (10), pin 24
20 Data carrier detect, channel 4 (10) Connector 4 (10), pin 8
21 Data set ready, channel 4 (10) Connector 4 (10), pin 6
22 Clear to send, channel 4 (10) Connector 4 (10), pin 5
23 External receive clock, channel 5 (11) Connector 5 (11), pin 11
24 Transmit data, channel 5 (11) Connector 5 (11), pin 2
25 External transmit clock, channel 5 (11) Connector 5 (11), pin 24
26 Data carrier detect, channel 5 (11) Connector 5 (11), pin 8
27 Data set ready, channel 5 (11) Connector 5 (11), pin 6
28 Clear to send, channel 5 (11) Connector 5 (11), pin 5
29 Transmit data, channel 6 (12) Connector 6 (12), pin 2
30 External transmit clock, channel 6 (12) Connector 6 (12), pin 24
31 Data carrier detect, channel 6 (12) Connector 6 (12), pin 8
32 Data set ready, channel 6 (12) Connector 6 (12), pin 6
33 Clear to send, channel 6 (12) Connector 6 (12), pin 5
34 External receive clock, channel 6 (12) Connector 6 (12), pin 11
35 Receive clock, channel 1 (7) Connector 1 (7), pin 17
36 Request to send, channel 1 (7) Connector 1 (7), pin 4
37 Receive data, channel 1 (7) Connector 1 (7), pin 3
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Installation and Operation Manual Appendix A Pinouts
LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2 Octopus Cable A-5
38 Transmit clock, channel 1 (7) Connector 1 (7), pin 15
39 Data terminal ready, channel 1 (7) Connector 1 (7), pin 20
40 External receive clock, channel 1 (7) Connector 1 (7), pin 11
41 Receive clock, channel 2 (8) Connector 2 (8), pin 17
42 Request to send, channel 2 (8) Connector 2 (8), pin 4
43 Receive data, channel 2 (8) Connector 2 (8), pin 3
44 Transmit clock, channel 2 (8) Connector 2 (8), pin 15
45 Data terminal ready, channel 2 (8) Connector 2 (8), pin 20
46 External receive clock, channel 2 (8) Connector 2 (8), pin 11
47 Receive clock, channel 3 (9) Connector 3 (9), pin 17
48 Request to send, channel 3 (9) Connector 3 (9), pin 4
49 Receive data, channel 3 (9) Connector 3 (9), pin 3
50 Transmit clock, channel 3 (9) Connector 3 (9), pin 15
51 Data terminal ready, channel 3 (9) Connector 3 (9), pin 20
52 Receive clock, channel 4 (10) Connector 4 (10), pin 17
53 Request to send, channel 4 (10) Connector 4 (10), pin 4
54 Receive data, channel 4 (10) Connector 4 (10), pin 3
55 Transmit clock, channel 4 (10) Connector 4 (10), pin 15
56 Data terminal ready, channel 4 (10) Connector 4 (10), pin 20
57 External receive clock, channel 4 (10) Connector 4 (10), pin 11
58 Receive clock, channel 5 (11) Connector 5 (11), pin 17
59 Request to send, channel 5 (11) Connector 5 (11), pin 4
60 Receive data, channel 5 (11) Connector 5 (11), pin 3
61 Transmit clock, channel 5 (11) Connector 5 (11), pin 15
62 Data terminal ready, channel 5 (11) Connector 5 (11), pin 20
63 Receive clock, channel 6 (12) Connector 6 (12), pin 17
64 Request to send, channel 6 (12) Connector 6 (12), pin 4
65 Receive data, channel 6 (12) Connector 6 (12), pin 3
66 Transmit clock, channel 6 (12) Connector 6 (12), pin 15
67 Data terminal ready, channel 6 (12) Connector 6 (12), pin 20
68 Signal ground, all channels All connectors, pin 7
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Appendix A Pinouts Installation and Operation Manual
A-6 Octopus Cable LS-6N, LS-12 MP-2100/2104 Ver. 11, MP-4100 Ver. 1.2
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Tel: +972-3-6458181, Fax +972-3-6483331, +972-3-6498250
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LS-6N, LS-12
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